/*

 * Heirloom mailx - a mail user agent derived from Berkeley Mail.

 *

 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.

 */

/*

 * Copyright (c) 1980, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the University of

 *	California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#ifndef lint

#ifdef	DOSCCS

static char sccsid[] = "@(#)edit.c	2.24 (gritter) 3/4/06";

#endif

#endif /* not lint */

#include "rcv.h"

#include "extern.h"

#include <sys/stat.h>

#include <unistd.h>

/*

 * Mail -- a mail program

 *

 * Perform message editing functions.

 */

static int edit1(int *msgvec, int type);

/*

 * Edit a message list.

 */

int

editor(void *v)

{

	int *msgvec = v;

	return edit1(msgvec, 'e');

}

/*

 * Invoke the visual editor on a message list.

 */

int 

visual(void *v)

{

	int *msgvec = v;

	return edit1(msgvec, 'v');

}

/*

 * Edit a message by writing the message into a funnily-named file

 * (which should not exist) and forking an editor on it.

 * We get the editor from the stuff above.

 */

static int 

edit1(int *msgvec, int type)

{

	int c;

	int i;

	FILE *fp = NULL;

	struct message *mp;

	off_t size;

	char *line = NULL;

	size_t linesize;

	int	wb;

	/*

	 * Deal with each message to be edited . . .

	 */

	wb = value("writebackedited") != NULL;

	for (i = 0; msgvec[i] && i < msgCount; i++) {

		sighandler_type sigint;

		if (i > 0) {

			char *p;

			printf(catgets(catd, CATSET, 72,

					"Edit message %d [ynq]? "), msgvec[i]);

			fflush(stdout);

			if (readline(stdin, &line, &linesize) < 0)

				break;

			for (p = line; blankchar(*p & 0377); p++);

			if (*p == 'q')

				break;

			if (*p == 'n')

				continue;

		}

		setdot(mp = &message[msgvec[i] - 1]);

		did_print_dot = 1;

		touch(mp);

		sigint = safe_signal(SIGINT, SIG_IGN);

		fp = run_editor(fp, mp->m_size, type,

				(mb.mb_perm & MB_EDIT) == 0 || !wb,

				NULL, mp, wb ? SEND_MBOX : SEND_TODISP_ALL,

				sigint);

		if (fp != NULL) {

			fseek(mb.mb_otf, 0L, SEEK_END);

			size = ftell(mb.mb_otf);

			mp->m_block = mailx_blockof(size);

			mp->m_offset = mailx_offsetof(size);

			mp->m_size = fsize(fp);

			mp->m_lines = 0;

			mp->m_flag |= MODIFY;

			rewind(fp);

			while ((c = getc(fp)) != EOF) {

				if (c == '\n')

					mp->m_lines++;

				if (putc(c, mb.mb_otf) == EOF)

					break;

			}

			if (ferror(mb.mb_otf))

				perror("/tmp");

			Fclose(fp);

		}

		safe_signal(SIGINT, sigint);

	}

	if (line)

		free(line);

	return 0;

}

/*

 * Run an editor on the file at "fpp" of "size" bytes,

 * and return a new file pointer.

 * Signals must be handled by the caller.

 * "Type" is 'e' for ed, 'v' for vi.

 */

FILE *

run_editor(FILE *fp, off_t size, int type, int readonly,

		struct header *hp, struct message *mp, enum sendaction action,

		sighandler_type oldint)

{

	FILE *nf = NULL;

	int t;

	time_t modtime;

	char *edit;

	struct stat statb;

	char *tempEdit;

	sigset_t	set;

	if ((nf = Ftemp(&tempEdit, "Re", "w", readonly ? 0400 : 0600, 1))

			== NULL) {

		perror(catgets(catd, CATSET, 73, "temporary mail edit file"));

		goto out;

	}

	if (hp) {

		t = GTO|GSUBJECT|GCC|GBCC|GNL|GCOMMA;

		if (hp->h_from || hp->h_replyto || hp->h_sender ||

				hp->h_organization)

			t |= GIDENT;

		puthead(hp, nf, t, SEND_TODISP, CONV_NONE, NULL, NULL);

	}

	if (mp) {

		send(mp, nf, 0, NULL, action, NULL);

	} else {

		if (size >= 0)

			while (--size >= 0 && (t = getc(fp)) != EOF)

				putc(t, nf);

		else

			while ((t = getc(fp)) != EOF)

				putc(t, nf);

	}

	fflush(nf);

	if (fstat(fileno(nf), &statb) < 0)

		modtime = 0;

	else

		modtime = statb.st_mtime;

	if (ferror(nf)) {

		Fclose(nf);

		perror(tempEdit);

		unlink(tempEdit);

		Ftfree(&tempEdit);

		nf = NULL;

		goto out;

	}

	if (Fclose(nf) < 0) {

		perror(tempEdit);

		unlink(tempEdit);

		Ftfree(&tempEdit);

		nf = NULL;

		goto out;

	}

	nf = NULL;

	if ((edit = value(type == 'e' ? "EDITOR" : "VISUAL")) == NULL)

		edit = type == 'e' ? "ed" : "vi";

	sigemptyset(&set);

	if (run_command(edit, oldint != SIG_IGN ? &set : NULL, -1, -1,

				tempEdit, NULL, NULL) < 0) {

		unlink(tempEdit);

		Ftfree(&tempEdit);

		goto out;

	}

	/*

	 * If in read only mode or file unchanged, just remove the editor

	 * temporary and return.

	 */

	if (readonly) {

		unlink(tempEdit);

		Ftfree(&tempEdit);

		goto out;

	}

	if (stat(tempEdit, &statb) < 0) {

		perror(tempEdit);

		Ftfree(&tempEdit);

		goto out;

	}

	if (modtime == statb.st_mtime) {

		unlink(tempEdit);

		Ftfree(&tempEdit);

		goto out;

	}

	/*

	 * Now switch to new file.

	 */

	if ((nf = Fopen(tempEdit, "a+")) == NULL)

		perror(tempEdit);

out:

	if (tempEdit) {

		unlink(tempEdit);

		Ftfree(&tempEdit);

	}

	return nf;

}